Analysis

  • max time kernel
    145s
  • max time network
    146s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240419-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240419-enlocale:en-usos:windows10-2004-x64system
  • submitted
    04-05-2024 13:20

General

  • Target

    35f519000ad078d242c0bce097c59b31.exe

  • Size

    326KB

  • MD5

    35f519000ad078d242c0bce097c59b31

  • SHA1

    41a3c859c36a4240a51e6ce17ab269e8d2728eb0

  • SHA256

    1dc79692db8709e88fee042c5555f8432dc4638442887d8150b8b7c67f5f3eb2

  • SHA512

    260f2efe4757c518f96269ba3a3fd5b5c603fa6a52d9c0d976222158609911004ce48df4e75298c11de67ea29d91969f217986e4c0f1b83bb2f5d2a43a772997

  • SSDEEP

    3072:KLTZ5XJKQsp6NU4tqwCyc40r+oeHpmCR54kDSWegJSVE+Er20L4fdoiKuIov5QId:KbCt44p40rqHPbDb86r2LiNovrb/a

Malware Config

Extracted

Family

tofsee

C2

vanaheim.cn

jotunheim.name

Signatures

  • Tofsee

    Backdoor/botnet which carries out malicious activities based on commands from a C2 server.

  • Creates new service(s) 2 TTPs
  • Modifies Windows Firewall 2 TTPs 1 IoCs
  • Sets service image path in registry 2 TTPs 1 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Deletes itself 1 IoCs
  • Executes dropped EXE 1 IoCs
  • Drops file in System32 directory 2 IoCs
  • Suspicious use of SetThreadContext 1 IoCs
  • Launches sc.exe 3 IoCs

    Sc.exe is a Windows utlilty to control services on the system.

  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • Program crash 2 IoCs
  • Modifies data under HKEY_USERS 6 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\35f519000ad078d242c0bce097c59b31.exe
    "C:\Users\Admin\AppData\Local\Temp\35f519000ad078d242c0bce097c59b31.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:1404
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\dpyhugit\
      2⤵
        PID:3384
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\udjushz.exe" C:\Windows\SysWOW64\dpyhugit\
        2⤵
          PID:3116
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create dpyhugit binPath= "C:\Windows\SysWOW64\dpyhugit\udjushz.exe /d\"C:\Users\Admin\AppData\Local\Temp\35f519000ad078d242c0bce097c59b31.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2324
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description dpyhugit "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4200
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start dpyhugit
          2⤵
          • Launches sc.exe
          PID:2868
        • C:\Windows\SysWOW64\netsh.exe
          "C:\Windows\System32\netsh.exe" advfirewall firewall add rule name="Host-process for services of Windows" dir=in action=allow program="C:\Windows\SysWOW64\svchost.exe" enable=yes>nul
          2⤵
          • Modifies Windows Firewall
          PID:4424
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1404 -s 1040
          2⤵
          • Program crash
          PID:428
      • C:\Windows\SysWOW64\dpyhugit\udjushz.exe
        C:\Windows\SysWOW64\dpyhugit\udjushz.exe /d"C:\Users\Admin\AppData\Local\Temp\35f519000ad078d242c0bce097c59b31.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1236
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Deletes itself
          • Drops file in System32 directory
          • Modifies data under HKEY_USERS
          PID:2060
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1236 -s 512
          2⤵
          • Program crash
          PID:4268
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 1236 -ip 1236
        1⤵
          PID:4520
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 496 -p 1404 -ip 1404
          1⤵
            PID:2400

          Network

          MITRE ATT&CK Matrix ATT&CK v13

          Execution

          System Services

          1
          T1569

          Service Execution

          1
          T1569.002

          Persistence

          Create or Modify System Process

          2
          T1543

          Windows Service

          2
          T1543.003

          Boot or Logon Autostart Execution

          1
          T1547

          Registry Run Keys / Startup Folder

          1
          T1547.001

          Privilege Escalation

          Create or Modify System Process

          2
          T1543

          Windows Service

          2
          T1543.003

          Boot or Logon Autostart Execution

          1
          T1547

          Registry Run Keys / Startup Folder

          1
          T1547.001

          Defense Evasion

          Impair Defenses

          1
          T1562

          Disable or Modify System Firewall

          1
          T1562.004

          Modify Registry

          1
          T1112

          Discovery

          Query Registry

          1
          T1012

          System Information Discovery

          2
          T1082

          Replay Monitor

          Loading Replay Monitor...

          Downloads

          • C:\Users\Admin\AppData\Local\Temp\udjushz.exe
            Filesize

            10.3MB

            MD5

            38fcd5c51d318efb178c0bf416930268

            SHA1

            a324b9fa31c58f47b5deb70a1957232a87dfda3c

            SHA256

            30f8438fb85630b2652480fbc9bcfaa8a9c18553e50b4e67e5b90913fbde750a

            SHA512

            da78e75347597baba8ca6684ab778fd70c2bd9c00a0fca3988e93c2ddef57477cc81a1b8379d37514fef613f91d0e6fb74f2da5b4ac5a7c9814aaf7f7852b3b1

          • memory/1236-6-0x00007FF9F4A70000-0x00007FF9F4C65000-memory.dmp
            Filesize

            2.0MB

          • memory/1236-9-0x0000000000400000-0x0000000001A1B000-memory.dmp
            Filesize

            22.1MB

          • memory/1404-10-0x0000000000400000-0x0000000001A1B000-memory.dmp
            Filesize

            22.1MB

          • memory/1404-1-0x00007FF9F4A70000-0x00007FF9F4C65000-memory.dmp
            Filesize

            2.0MB

          • memory/1404-11-0x00007FF9F4A70000-0x00007FF9F4C65000-memory.dmp
            Filesize

            2.0MB

          • memory/2060-39-0x0000000002580000-0x0000000002590000-memory.dmp
            Filesize

            64KB

          • memory/2060-34-0x0000000002580000-0x0000000002590000-memory.dmp
            Filesize

            64KB

          • memory/2060-13-0x0000000000FC0000-0x0000000000FD5000-memory.dmp
            Filesize

            84KB

          • memory/2060-19-0x0000000002570000-0x0000000002576000-memory.dmp
            Filesize

            24KB

          • memory/2060-50-0x00000000025E0000-0x00000000025E7000-memory.dmp
            Filesize

            28KB

          • memory/2060-49-0x0000000007E00000-0x000000000820B000-memory.dmp
            Filesize

            4.0MB

          • memory/2060-45-0x00000000025D0000-0x00000000025D5000-memory.dmp
            Filesize

            20KB

          • memory/2060-42-0x00000000025D0000-0x00000000025D5000-memory.dmp
            Filesize

            20KB

          • memory/2060-41-0x0000000002580000-0x0000000002590000-memory.dmp
            Filesize

            64KB

          • memory/2060-40-0x0000000002580000-0x0000000002590000-memory.dmp
            Filesize

            64KB

          • memory/2060-7-0x0000000000FC0000-0x0000000000FD5000-memory.dmp
            Filesize

            84KB

          • memory/2060-38-0x0000000002580000-0x0000000002590000-memory.dmp
            Filesize

            64KB

          • memory/2060-37-0x0000000002580000-0x0000000002590000-memory.dmp
            Filesize

            64KB

          • memory/2060-36-0x0000000002580000-0x0000000002590000-memory.dmp
            Filesize

            64KB

          • memory/2060-35-0x0000000002580000-0x0000000002590000-memory.dmp
            Filesize

            64KB

          • memory/2060-12-0x0000000000FC0000-0x0000000000FD5000-memory.dmp
            Filesize

            84KB

          • memory/2060-33-0x0000000002580000-0x0000000002590000-memory.dmp
            Filesize

            64KB

          • memory/2060-32-0x0000000002580000-0x0000000002590000-memory.dmp
            Filesize

            64KB

          • memory/2060-31-0x0000000002580000-0x0000000002590000-memory.dmp
            Filesize

            64KB

          • memory/2060-30-0x0000000002580000-0x0000000002590000-memory.dmp
            Filesize

            64KB

          • memory/2060-29-0x0000000002580000-0x0000000002590000-memory.dmp
            Filesize

            64KB

          • memory/2060-28-0x0000000002580000-0x0000000002590000-memory.dmp
            Filesize

            64KB

          • memory/2060-27-0x0000000002580000-0x0000000002590000-memory.dmp
            Filesize

            64KB

          • memory/2060-26-0x0000000002580000-0x0000000002590000-memory.dmp
            Filesize

            64KB

          • memory/2060-25-0x0000000002580000-0x0000000002590000-memory.dmp
            Filesize

            64KB

          • memory/2060-22-0x0000000002580000-0x0000000002590000-memory.dmp
            Filesize

            64KB

          • memory/2060-18-0x0000000002E00000-0x000000000300F000-memory.dmp
            Filesize

            2.1MB

          • memory/2060-47-0x0000000007E00000-0x000000000820B000-memory.dmp
            Filesize

            4.0MB

          • memory/2060-16-0x0000000002E00000-0x000000000300F000-memory.dmp
            Filesize

            2.1MB